Ankie Piters, Marc Allaart, Wesley Sluis, Wytze Lenstra, KNMI

Royal Netherlands Meteorological InstituteMinistry of Infrastructure and Environment

An update on the NO2 sonde

ESA’s Innovation Triangle Innitiative

“Programme to foster the introduction of breakthrough innovations and technologies for space applications. “

Purpose is to make the NO2 sonde ready for serial production:

- improve the calibration procedure

- improve the design

- transfer the knowledge to industry

Cooperation with GRAW radiosondes to produce the sonde

Duration of this project: 15 months

External reviewer/advisor: Michel Van Roozendael, BIRA

Aim: user evaluation model end 2013, GRAW product end 2015

MAXDOAS retrievals 25 June

Picture from Folkard Wittrock, IUPBNO2 sonde 25 June

What happened after CINDI?

winterDe Bilt, the Netherlands

November 2010 –February 2011

9 flights

DISCOVER-AQBaltimore /

Washington, USAJuly 2011 8 flights

PEGASOSCabauw, the Netherlands

May 20127 flights +

7 ground sondes

DISCOVER-AQ campaign 2011, USA

aircraft and tethered balloon measurements

NO2 sondeCRDS

profile measured during aircraft descend, 20 July

thanks to: Russ Dickerson (UMD) and Richard Clark (Millersville Univ)

PEGASOS campaign May 2012, Netherlands

Weather balloon

Marc and Ankie with 2 sondes

Zeppelin

2 MAX-DOAS-ses

NOx analyser

~500 m distance side-by-side measurement

RIVM NOx analyserNO2 sonde1 min. average of NO2 sonde

data: Lou Gast, RIVM

On-ground comparisons with NOx analyser (BLC)

bottle #2bottle #1 #3

Sensitivity of luminol increases with time

500 m

6:00 7:00 8:30 9:45

AQ model (H. Elbern, Univ. Cologne) 1200 m

0 m

27-5-2012

Comparing with models

model data: Henk Eskes and Patricia Castellanos, KNMI

24h backtracjectory 7 Dec, 8:00 UT, 1km

NO2 above BL6 Dec, 15:00 UT

NO2 profiles along trajectorie

Next stepsWhat determines/affects sensitivity?

Optimise design

Optimise calibration procedure

Transfer knowledge to GRAW radiosondes

And also:

Analyse DISCOVER-AQ and PEGASOS data

Demonstrate the use for:

Model evaluation

MAX-DOAS interpretation

Satellite validation

Chasing the sondes during PEGASOS